I got to drive a oil-head for the first time a month or so ago. An '01. Slower than Xmas! Slow to rev up. Slow to accelerate. Too much vibration. And I like Beemers, but I guess my K-bike experience spoiled the 2-bangers for me. I'd say think K-bike if you want a Beemer.
Oh, and yeah, they are often thought of as old man bikes. That's what my relatives in Austria call them. They're meaning the traditional opposed twins, though.
Got some nice parallel vertical 800s coming, though. Those might be able to move. Rotax engines.
I know the opposed twins have been repeatedly tweaked over the years, but really, they are almost as old a design as a certain competitor's V-Twin, aren't they? Or older? And if a Bandit is an old man's bike, please keep 'em coming!